Light curves and Fourier coefficients for a subsample of the MACHO Delta Scuti stars

Details Light curves and Fourier coefficients for a subsample of the MACHO Delta Scuti stars Light curves and Fourier coefficients for a subsample of the MACHO Delta Scuti stars

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998dssn...12...18t&link_type=abstract

Delta Scuti Star Newsletter, Issue 12, p. 18-21.

Computer Science

3

Scientific paper

We have compiled a sample of Delta Scuti candidates from the MACHO catalog of variable stars in the direction of the Galactic Bulge, and a detailed spectral analysis of this time series data is in progress. The MACHO project (see Alcock et al. 1997) has collected a massive amount of photometry on millions of stars in the directions of the Galactic Bulge and the Large and Small Magellanic Clouds. Many thousands of variable stars have been detected, among them Delta Scuti stars (towards the Galactic Bulge only; Delta Scuti stars in the LMC and SMC are below the detection limits of MACHO). See the discovery paper of Minniti et al. (1997) for more background and sample light curves. Of our initial sample of 136 stars showing variability on timescales less than 0.3d and with (V-R) colors similar to those of Delta Scuti stars, we find that sim 90 are likely Delta Scuti stars, with the remainder being either eclipsing binaries of W Ursa Majoris type ``A'' or which require more detailed observations for classification. The ultimate goal of our study is to determine as accurately as possible the pulsation spectra and pulsation mode types of the candidate Delta Scuti stars. In the present paper, we discuss the general light curve shapes of these objects by analyzing the Fourier harmonics of observed pulsation modes. This technique has been explored in some detail for Cepheids (Simon & Lee 1981) and for Delta Scuti stars (Antonello et al. 1987; Poretti et al. 1990). Recent non-linear modeling work by Bono et al. (1997) suggests that the light curve shape is a strong indicator of the radial overtone number for radially pulsating Delta Scuti stars. Therefore, Fourier analysis of pulsation frequencies and their Fourier harmonics may indicate which overtone a given star is pulsating in. Here, we present the initial results for a subsample of the MACHO Delta Scuti stars.

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